What Causes Knee Pain?

Person stretching outdoors before exercise, highlighting activities and movement that can contribute to knee pain.

Our knees take a lot of stress, whether running a marathon or gardening. They support our weight and provide stability so we can walk, run, bend, and climb.

Knee pain is common and can affect anyone, from athletes to older adults. Resting the knee and treating pain at home often helps. However, if your pain persists and slows you down, make an appointment with an orthopedic specialist.

At Corewell Health, our experts diagnose and treat knee pain to help you return to the activities you love.

Where knee pain comes from

The knee is the largest joint in the body. It connects the thigh bone (femur), shinbone (tibia), and kneecap (patella). Cartilage cushions the bones. The meniscus, a type of cartilage in the knee, helps absorb shock. Ligaments and tendons stabilize the joint. Together, they allow the knee to bend, straighten, and support movement.

Person performing a seated butterfly stretch on a yoga mat at home, illustrating activity and flexibility linked to knee pain causes.

Knees are prone to injury and wear and tear over time. Where you feel knee pain can help point to the cause:

  • Pain in the front of the knee may come from the kneecap or tendons
  • Pain on the inside or outside of the knee may relate to cartilage or ligament injuries
  • Pain behind the knee may develop from injury or swelling

Common causes of knee pain

Everyday movements like walking, climbing stairs, squatting, or bending the knee can cause pain. Sports, exercise, overuse, and injuries can also cause knee pain.

Knee osteoarthritis
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The cartilage that cushions the knee joint breaks down over time, causing the bones to rub together. Knee osteoarthritis is the most common cause of knee pain in adults over 50. Symptoms typically include pain, stiffness, and swelling that worsen after waking up, sitting for too long, or after being active. Knee pain at night is also common.

When to see a doctor for knee pain

Knee pain often improves with rest and self-care. You should seek immediate medical care after an injury, especially if you hear or feel a popping sensation. This can be a sign of a ligament tear, meniscus tear, or other serious knee injury.

See a doctor if knee pain causes:

  • Fever along with knee pain
  • Inability to straighten or bear weight on your leg
  • Locking or catching in the knee
  • Pain that disrupts sleep
  • Significant swelling
Patient discussing knee pain with a doctor during a medical exam in a clinic treatment room.

Treating knee pain

Knee pain treatments focus on reducing pain, improving movement, and helping you safely return to daily activities, exercise, or sports. The cause of your knee pain helps determine the right treatment approach. At-home treatments, physical therapy, or injections can often improve knee pain. Some knee conditions that cause chronic pain may require minimally invasive surgery.

At-home treatments
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Self-care may help improve knee pain from overuse, strenuous activity, or arthritis.

RICE stands for rest, ice, compression, and elevation. It helps reduce swelling and gives the knee time to recover by limiting activities that put additional stress on the joint.

Taking over-the-counter (OTC) medications may help reduce pain and inflammation. Talk to your doctor before starting a new medication and take it as directed.

If knee pain doesn’t improve with self-care, make an appointment with an orthopedic specialist. Your doctor will perform a physical exam and discuss your knee pain symptoms. They may order imaging tests, such as an X-ray or MRI scan.

Expert care for knee pain

We help you find the right treatment and get back to doing what you love.